N-Type Semiconductor Composition for Low Blue-Light Absorption
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Solution Overview
Problem
Fullerene-based organic photoelectric devices suffer from reduced color clarity due to light absorption in the blue region, necessitating the development of an n-type semiconductor that minimizes blue region absorption while maintaining heat resistance.
Innovation Solution
An n-type semiconductor is developed, represented by specific compounds (Chemical Formulas 1 and 2), which include electron withdrawing functional groups to reduce blue light absorption and enhance heat resistance, integrated into thin films and organic photoelectric devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fullerene is used in the organic photoelectric device, then electrical properties and light absorption are improved, but color clarity deteriorates due to blue region absorption
Solution Approach 1:
The patent modifies the chemical structure of fullerene by introducing specific substituents (such as fluorine atoms, alkyl groups, or aryl groups) at predetermined positions on the fullerene cage. This structural parameter change alters the electronic properties and HOMO-LUMO energy levels, thereby shifting the absorption spectrum to reduce blue region absorption while preserving electron transport capabilities. For example, adding electron-withdrawing groups can raise the HOMO level and reduce overlap with blue light wavelengths.
Solution Approach 2:
The patent employs composite material strategies by combining modified fullerene derivatives with other organic semiconductor materials or blending different fullerene derivatives in specific ratios. This creates a composite active layer that balances the advantages of different materials - maintaining good electron transport properties while reducing the harmful blue light absorption through material composition optimization.
2Ease of manufacture
If conventional n-type semiconductors are used, then manufacturing is simplified, but heat resistance deteriorates
Solution Approach 1:
The patent introduces specific structural parameters into the fullerene derivative molecules, such as adding rigid aromatic groups, cyclic structures, or cross-linking capabilities, which enhance thermal stability and glass transition temperature. These parameter changes allow the material to maintain structural integrity at high temperatures while preserving the ease of solution processing and vacuum deposition that make fullerene derivatives manufacturable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The n-type semiconductor improves color clarity by reducing blue light absorption and maintains electrical properties, effectively addressing the color clarity issue in organic photoelectric devices.
Implementation Method 1
fullerene may absorb light in a blue region (about 450 nm region) and reduce color clarity of the organic photoelectric device to which the fullerene is applied
Implementation Method 2
An organic photoelectric device is a device that converts light into an electrical signal using a photoelectric effect
Data Source
AI summary
Disclosed are an n-type semiconductor including compound represented by Chemical Formula 1 or Chemical Formula 2, an image sensor, and an electronic device.In Chemical Formula 1 and Chemical Formula 2, each substituent is as defined in the detailed description.